Which of the following is a common symptom of poisoning?

Respiratory distress is a common symptom of poisoning because many toxic substances can directly affect the respiratory system. When a person is exposed to a poison, it can lead to various physiological reactions that impair normal breathing. This might include symptoms such as difficulty breathing, shortness of breath, or a feeling of constriction in the chest. Respiratory distress can occur due to various mechanisms, depending on the type of poison involved; for example, some chemicals might cause inflammation in the airways or reduce the efficiency of gas exchange in the lungs.

In contrast, increased appetite, improved coordination, and enhanced cognitive function do not typically align with the symptoms of poisoning. These options suggest a state of well-being or improvement, which is contrary to the debilitating effects often experienced during a poisoning incident.